Adaptive Cruise Control (ACC)
Introduction
This chapter contains information on the following subjects:
Settings in Infotainment
233
Operation
234
Automatic stopping and starting
234
Operation overview
235
Start control
235
Stop/resume control
235
Set/change the desired speed
236
Set the clearance level
236
Special driving situations
236
Overtaking and towing
237
Malfunctions
237
The Adaptive Cruise Control (hereinafter referred to as ACC) maintains the set
speed or the distance to the vehicle ahead without the accelerator or brake
pedal being pressed.
The front of the vehicle and the distance to the vehicle ahead is monitored by
a radar sensor » page 212.
The state in which the ACC maintains the speed or the proximity is described
as control from here on.
WARNING■
The general information relating to the use of assistance systems must
be observed » page 212, in section Introduction .■
The driver must always be ready to take over the operation of the accel-
erator and brake pedal.
■
The ACC does not react when approaching a stationary obstacle, such as
traffic jams, vehicle breakdowns or vehicles waiting at a traffic light.
■
The ACC does not respond to crossing or oncoming objects.
■
If the ACC does not decelerate fast enough, immediately apply the vehi-
cle's foot brake.
WARNINGFor safety reasons, do not use the ACC under the following conditions.■When driving in turning lanes, motorway exits or construction sites, to
avoid an unwanted acceleration to the stored speed.■
When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
■
When road conditions are poor (e.g. ice, slippery road, gravel, dirt road).
■
Driving in “sharp” corners or in steep gradients / on steep inclines.
■
When driving through places where metal objects (such as metal build-
ings, railway tracks, etc.) can be found.
■
When driving through very divided and enclosed spaces (such as large-ca-
pacity garages, car ferries, tunnels and the like.).
Note
■ The ACC is designed primarily for use on motorways.■The ACC reduces the speed by automatically releasing the accelerator or by
means of a braking procedure as appropriate. If the brakes are used for an au-
tomatic speed reduction at any moments, then the brake light illuminates.■
In case of failure of more than one brake light on the vehicle or on the con-
nected trailer, the ACC becomes unavailable.
■
The control automatically cancels the engagement of the brake supportive
assistance systems (e.g. ESC) or when the maximum permitted engine speed is
exceeded.
Settings in Infotainment
Read and observe
on page 233 first.
›
Press the button, then tap on the function surface
→
Driver assistance
.
■ ACC (adaptive cruise control) - Setting for the adaptive cruise control
■
Driving progr.:
- Set the vehicle acceleration when adaptive cruise control is
activated 1)
■
Last selec. Distance
- Switch on/off of the last distance selected
■
Distance:
- Set the distance monitoring to the vehicles ahead
1)
This can be set in the menu on vehicles with a travel mode option as follows » page 240 .
233Assist systems
OperationFig. 294
Instrument cluster display: Examples of ACC displays
Fig. 295
Instrument cluster display: Examples of ACC status displays
Read and observe
on page 233 first.
The ACC allows you to set a speed of 30 - 160 or 210 km / h (depending on
equipment) and the distance to the vehicle ahead in the range of a very short
to a very long distance.
The ACC adjusts the set speed with respect to the detected vehicle ahead,
thus maintaining the selected proximity.
The ACC can detect a vehicle that is up to approx. 150 m ahead using the radar
sensor.
ACC displays » Fig. 294
Vehicle detected (control active)
Line showing the displacement of the distance when setting » page 236,
Set the clearance level
12Set distance to the vehicle ahead
Vehicle detected (control deactivated)
ACC status displays » Fig. 295
Regulation is inactive (in the colour display the digits of speed limits is
shown in grey).
Regulation active - no vehicle detected (in the colour display the digits of
the speed limits are highlighted).
Regulation deactivated - no speed stored.
Regulation active - vehicle detected (in the colour display the digits of the
speed limits are highlighted).
Note to reduce speed
If the delay of the ACC is insufficient in relation to the vehicle in front, the
warning light lights up in the instrument cluster and the display shows a
message to engage the brake pedal.
Regulation according to the vehicle in the adjacent lane
During regulation your vehicle may be regulated according to the vehicle in the
adjacent lane.
This could occur at speeds above about 80 km/h when your vehicle is moving
faster than the vehicle in the adjacent lane on the driver's side. The display
shows the detected vehicle is in the adjacent lane.
Note
Some ACC notifications in the display of the instrument cluster may be hidden
by notifications for other functions. An ACC notification automatically appears
for a brief moment when there is a change in status of the ACC.
Automatic stopping and starting
Read and observe
on page 233 first.
Vehicles with an automatic transmission can decelerate to a standstill and
start moving again using the ACC.
Decelerate to a standstill
If a vehicle ahead decelerates to a standstill, the ACC will also decelerate your
vehicle to a standstill.
Starting to drive again after a holding period
As soon as the vehicle ahead starts moving again after a holding period, your
vehicle will also move and the speed will continue to be regulated.
34234Driving
When cornering
When driving into or driving out of long corners, it could be that a vehicle is
travelling in the adjacent lane and is scanned by the radar » Fig. 297 -
. The
host vehicle is then controlled according to this vehicle.
Narrow vehicles or vehicles travelling side by side
A narrow or offset vehicle driving can only be recognized by the ACC if this is
located in the scanning range of the radar » Fig. 297 -
.
Other vehicles changing lanes
Vehicles that change onto the lane with a small distance » Fig. 298 -
may not
be detected by ACC in good time.
Stationary vehicles
The ACC does not detect stationary objects! When a vehicle detected by the
ACC turns or sheers off and there is a stationary vehicle in front of this vehi-
cle, » Fig. 298 -
the ACC does not respond to the stationary vehicle.
Vehicles with special load or special body parts
Other vehicles with a load or with body parts protruding from the sides, back
or top of the vehicle contour may not be detected by the ACC.
Overtaking and towing
Read and observe
on page 233 first.
When overtaking
When your vehicle is being controlled at a speed that is lower than the set
speed and the turn signal is operated, ACC assesses this situation as meaning
that the driver wishes to overtake. The ACC automatically accelerates the vehi-
cle, thereby reducing the proximity to a vehicle ahead.
If your vehicle changes to the overtaking lane and no vehicle is detected
ahead, ACC accelerates until the set speed is reached and then keeps it con-
stant.
Acceleration can be cancelled at any time by touch on the brake pedal or
pressing the button on the lever
» Fig. 296 on page 235 .
Towing a trailer
When towing, or if another accessory is connected to the trailer socket, ACC
control is set with a lower rate. The manner of driving should therefore be
adapted to this limitation.
Malfunctions
Read and observe
on page 233 first.
If, for some unknown reason, ACC is not available, the warning light
appears
in the display of the instrument cluster and an appropriate message is shown.
Sensor covered / dirty
If the sensor cover or the sensor is dirty or covered, a message appears on the
instrument cluster display stating there is no sensor view. Clean the sensor
cover or remove the obstacles » Fig. 264 on page 212 .
If there is no sensor view in the winter, the snow on the sensor under the cov- er could be the reason. The ACC is functional again after the snow melts away
from the sensor.
ACC not available
If the ACC is currently unavailable, a message concerning the unavailability ap-
pears. Stop the vehicle, switch off the engine and then start it again. If ACC
continues to be unavailable, seek the assistance of a specialist garage.
ACC fault
With an ACC fault, an error message appears. Seek help from a specialist ga-
rage.
Front Assist
Introduction
This chapter contains information on the following subjects:
Settings in Infotainment
238
Operation
238
Distance warning
238
Warning and automatic braking
238
Deactivation/activation
239
Malfunctions
240
The Front Assist (hereinafter referred to as the system) warns you of the dan-
ger of a collision with a vehicle or another obstacle in front of the vehicle, and
tries to avoid a collision or mitigate its consequences by automatically applying
the brakes where necessary.
The area in front of the vehicle is monitored by a radar sensor » page 212.
237Assist systems
WARNINGIn the following situations, Front Assist should be switched off for safety
reasons.■
When the vehicle is being towed away.
■
When the vehicle is on a rolling test bench.
■
If an unfounded warning or a system action was taken.
■
When on a truck, or a car ferry service or similar.
Malfunctions
Read and observe
and on page 238 first.
If, for some unknown reason, the system is not available, an appropriate mes-
sage appears in the display of the instrument cluster.
Sensor covered / dirty
If the sensor cover or the sensor is dirty or covered, a message appears on the
instrument cluster display stating there is no sensor view. Clean the sensor
cover or remove the obstacles » Fig. 264 on page 212 .
If there is no sensor view in the winter, the snow on the sensor under the cov- er could be the reason. The system is functional again after the snow melts
away from the sensor.
System unavailable
If the system is currently unavailable, a message concerning the unavailability
appears. Stop the vehicle, switch off the engine and then start it again. If the
system still is not available, seek the assistance of a specialist garage.
Select the driving mode (Driving Mode Selection)
Introduction
This chapter contains information on the following subjects:
Adaptive Chassis Control (DCC)
240
mode
Eco240
Mode
Comfort241
Mode
Normal241
Mode
Sports241
Mode
individual241Mode selection and Infotainment display241Settings for individual
mode242
By selecting the driving mode, the driving behaviour can be adapted to the de-
sired mode of operation.
the following modes
Eco
.
Comfort
.
normal
.
Sports
and
individual
are available.
The mode
Comfort
is only available on vehicles with adaptive chassis control
(DCC).
WARNINGPlease take note of the general points relating to the use of assistance
systems » page 212, in section Introduction .
Adaptive Chassis Control (DCC)
Read and observe
on page 240 first.
The adaptive chassis control (following known as DCC) provides the ability to
adjust the shock characteristics for the sporty, normal or comfortable driving
when the corresponding control mode is selected.
The DCC evaluates steering response and road conditions while driving contin- uously and adjusts the suspension behaviour within the selected driving mode
accordingly.
mode
Eco
Read and observe on page 240 first.
This mode is suitable for a relaxed style of driving and helps to save fuel.
Selecting this mode primarily affects the function of the following systems.
Drive
Vehicle acceleration is more relaxed than in
Normal
mode.
The recommended gear is controlled such to achieve the lowest possible fuel
consumption » page 44.
If the START-STOP system is deactivated manually » page 202, this will be au-
tomatically activated.
The automatic gearbox is set automatically to mode E » page 207 .
240Driving
The first protection level can be deactivated in one of the following ways.
▶ in the menu in Infotainment
→ →
Driver assistance
.
▶ Deactivating the TCS » page 214.
▶ By selecting the driving mode
Sport
» page 241 .
Provided that the driving mode
Sport
is not selected, the system is activated
over the two levels of protection after switching the ignition off and on again.
The second level of protection
The system intervenes only if the situation is evaluated as critical, such as
when panic braking at high speeds.
This level of protection cannot be deactivated.
Vehicles with the Front Assist system
Using this information, a system intervention may also occur when there is the danger of a collision with an obstacle detected in front of the vehicle.
Lane Departure Warning (Lane Assist)
Introduction
Fig. 303
Sensor for Lane Assist
This chapter contains information on the following subjects:
Settings in Infotainment
243
Operation
244
Activation / deactivation
245
Malfunctions
245
The lane departure warning (following known as system) helps to keep the ve-
hicle between the boundary lines of a lane.
The system recognises the boundary lines of the lane using a sensor
» Fig. 303 .
When the vehicle approaches a detected line between lanes, the system
makes a light movement of the steering wheel in the opposite direction to the
boundary line. This corrective steering intervention can be manually overrid-
den at any time.WARNING■ Please take note of the general points relating to the use of assistance
systems » page 212, in section Introduction .■
Lane Assist can help you keep the vehicle within the lane. However, it
does not steer the vehicle for you. The driver retains full responsibility for
steering at all times.
■
Some objects or markings on the road can be recognised as the boundary
lines - an erroneous steering intervention may be the result.
WARNINGThe system may not be able to recognise the boundary line, or recognise it
incorrectly, for example, in the following situations.■
When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
■
When driving in “sharp” bends.
■
The sensor is blinded by the sun or oncoming traffic.
■
The field of view of the sensor is limited by an obstacle or a preceding ve-
hicle.
CAUTION
Do not attach any stickers or similar objects in front of the sensor on the wind-
screen to avoid impairing the functions of the system.
Note
■ The system is designed for driving on motorways and roads with adequate
longitudinal markings.■
The system can detect both continuous and broken lines.
Settings in Infotainment
Read and observe
and on page 243 first.
›
Press the button, then tap on the function surface
→
Driver assistance
.
■ Lane Assist (lane departure warning sys.) - Settings for Lane Assist
■
Active
- Activate/deactivate the assistant
■
Adaptive lane guidance
- Activate/deactivate adaptive lane guidance
243Assist systems
Activation / deactivationRead and observe
and on page 243 first.
The activation/deactivation of the system can be carried out in one of two
ways. ▶ In the instrument cluster display » page 48, Menu item
Assist systems
.
▶ In Infotainment » page 243, Settings in Infotainment .
Adaptive tracking can also be enabled or disabled In Infotainment.
After switching off and switching on the ignition, the system setting is re-
tained.
Note
The system setting is stored (depending on the Infotainment type) in the ac-
tive user account personalisation » page 49.
Malfunctions
Read and observe
and on page 243 first.
If, for some unknown reason, the system is not available, an appropriate mes-
sage appears in the display of the instrument cluster.
Sensor covered / dirty
If the windscreen is dirty, iced or misted up in the sensor area, a message ap-
pears indicating that there is no sensor view. Clean the windscreen or remove
the obstacles from the sensor area.
System unavailable
If the system is currently unavailable, a message concerning the unavailability
appears. Try to re-activate the machine. If the system still is not available, seek
the assistance of a specialist garage.
System fault
In the case of a system fault, an error message appears. Seek help from a spe-
cialist garage.
Request to take over steering
If the system detects that there are no hands are on the steering wheel, this
will not work properly. You will be prompted to take over steering. Place your
hands on the steering wheel.
Traffic jam assistant
Introduction
This chapter contains information on the following subjects:
Function
245
Operating conditions
245WARNING■ Please take note of the general points relating to the use of assistance
systems » page 212, in section Introduction .■
The driver must always have hands on the steering wheel and be ready to
take over steering of the vehicle himself (accelerate or brake).
Note
The system is designed primarily for use on motorways.
Function
Read and observe
on page 245 first.
The traffic jam assistant (referred to as system) helps to keep the vehicle with-
in the lane at speeds below 65 km/h while keeping the distance to the vehicle
ahead.
The system is only available for vehicles with Automatic transmission.
The traffic jam assistant is an extension of the systems Lane Assist » page 243
and ACC » page 233 and works by using the functions of these two systems.
For this reason, the chapters on System Lane Assist and ACC are to be read
carefully and the safety notes are to be observed.
Operating conditions
Read and observe
on page 245 first.
The system activation occurs automatically whilst fulfilling the following ba-sic conditions.
Lane Assist with the adaptive tracking is enabled, the boundary lines on
both sides are recognized lane » page 243.
ACC is activated and the regulation » page 233 follows.
The vehicle speed is below 65 km/h.
245Assist systems
WARNINGThe traffic signs may not be displayed or displayed incorrectly in the system
e.g. in the following situations.■
When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
■
The sensor is blinded by the sun or oncoming traffic.
■
The field of view of the sensor is limited by an obstacle or a preceding ve-
hicle.
■
Travelling at high speed.
■
The traffic signs are covered (e.g. by trees, snow or dirt).
■
The traffic signs are not standard (round with a red border) or are dam-
aged.
■
The traffic signs are attached to flashing neon signs.
■
The traffic signs were changed (the navigation data are out of date).
Note
The system is only available in some countries.
Settings in Infotainment
Read and observe
on page 246 first.
›
Press the button, then tap on the function surface
→
Driver assistance
.
■ Dynamic Road Sign Display - Settings for the Dynamic Road Sign Display
■
Show in instrument cluster
- Activation/deactivation of the additional traffic
signs in the display of the instrument cluster
■
Speed warning:
» page 240 - Setting a warning when exceeding the speed
limit
■
Warning at over
- Setting warning timing with the option to exceed the speed
limit in a range from 0 to 20 km / h
■ Trailer recognition
■
Show road signs relevant to trailers
- Activating / deactivating display of road
signs relevant to trailers
■
Use for route calculation
- Activation / deactivation of taking the trailer into ac-
count for route calculation in navigation
■
Maximum speed for trailer
- Set the top speed for towing a trailer
OperationFig. 306
Sensor for Dynamic Road Sign
Display
Fig. 307
Instrument cluster display: Display examples
Read and observe
on page 246 first.
Description of indications and displayed traffic signs
Display » Fig. 307Display of detected traffic signs » page 46, Driving data (Multifunction
display)Additional display (monochromatic display)Additional display (colour display)
The system can display the following (vertical) traffic signs where identified. ▶ Speed limit.
▶ Overtaking prohibited.
Additional signs, such as 'when wet' or signs which only apply for a limited
time can also be displayed.
The system displays only traffic signs that are in the “viewing area” of the sen-
sor » Fig. 306 .
247Assist systems
Data from the sensor is supplemented by information from the Infotainment
Navigation. This is the reason why traffic signs with maximum speeds can also
be shown on sections of roads which do not have any traffic signs.
Warning when exceeding the speed limit
The warning when exceeding the permissible speed (based on the detected
traffic sign) can be activated and set in Infotainment » page 247.
Mode when towing a trailer
For vehicles with a factory-fitted towing device, in the Infotainment it is possi- ble to enable or disable the relevant traffic signs for trailer operation and the
top speed for towing a trailer » page 247, Settings in Infotainment .
Additional display
Read and observe
on page 246 first.
If the menu item Road sign is currently not shown » Fig. 307 on page 247 -
,
the road sign with the speed limit will appear in the upper display area of the
instrument cluster » Fig. 307 on page 247 -
,
.
If several traffic signs are detected simultaneously, in some cases the next
traffic sign will also be displayed in the colour display - » Fig. 307 on page 247 -
.
All detected traffic signs can be displayed via the multifunction display in the
menu item Traffic Sign Recognition » Fig. 307 on page 247 -
.
This additional function can be activated/deactivated in Infotainment
» page 247 .
Note
The setting (activation/deactivation) of the auxiliary display will be saved (de-
pending on the Infotainment type) in the active user account personalisation
» page 49 .
Malfunction and information messages
Read and observe
on page 246 first.
If, for some unknown reason, the system is not available, an appropriate mes-
sage appears in the display of the instrument cluster.
Sensor covered / dirty
If the screen in the sensor area is dirty, iced or misted, a caution to clean the
screen appears. Clean the windscreen or remove the obstacles from the sen-
sor area.
System fault
In the case of a system fault, an error message appears. Seek help from a spe-
cialist garage.
System limitation (Navigation data not available)
If the Infotainment Navigation submits no data, a message regarding the limi- tation of the system function appears. Check whether the map documents are
up to date or whether the vehicle is currently in a location for which no naviga-
tion data are available.
Traffic signs unavailable
No speed restriction is detected, a message is displayed regarding the unavail-
ability of road signs.
Fatigue detection
The fatigue detection system (following known as system) recommends the
driver taking a break from driving when, because of the driver's steering be-
haviour, driver fatigue can be detected.
From the starting of the journey, the system evaluates the steering behaviour
at speeds 65-200 km/h. If, while driving, there have been changes in the steer-
ing behaviours that are evaluated by the system as indicating possible fatigue,
a break recommendation is issued.
Conditions under which a break from driving is detected by the system ▶ The vehicle is stopped and the ignition switched off.
▶ The vehicle is stopped, the seat belt removed and the driver's door opened.
▶ The vehicle is stopped for more than 15 minutes.
If none of these conditions are met or if the driving style is not changed, the
system recommends a driving break again after 15 minutes.
The system can be activated//deactivated in infotainment in the
→
→
Driver assistance
menu.
Pause recommendation
The icon appears and the following message for a few seconds in the display
of the instrument cluster and a message about the detected fatigue. An au-
dible signal is also emitted.
248Driving